Germ cell's I believe. These are cells that includes half your genome in order to reproduce.
        
             
        
        
        
B. group of the same species that live together.
        
                    
             
        
        
        
Answer:
Atoms are electrically neutral as a result of having an equal amount of positive (due to the protons) and negative (due to the electrons) charges on it. 
An ion generally is an electrically unbalanced atom (i.e an atom with a net charge on it) 
A negative ion called an anion is produced when an atom gains an extra electron from a neighboring atom, giving it an extra negative charge. This can be produced by ionization with a radioactive radiation or simply by dissolution. 
A positive ion is called a cation and it is produced when an atom loses electron to a neighboring atom. The loss of this electron causes the positive charges to outweigh the negative charges in the atom. Cations can be produced by radioactive radiation ionization of an atom or by simple dissolution. 
The subatomic particle that is negative is the 'electron'. 
 
        
             
        
        
        
Plants make seeds that can grow into new plants, but if the seeds just fall to the ground under the parent plant, they might not get enough sun, water or nutrients from the soil. Because plants cannot walk around and take their seeds to other places, they have developed other methods to disperse (move) their seeds. The most common methods are wind, water, animals, explosion and fire.
        
                    
             
        
        
        
Answer: Plaques
Explanation:It’s used to describe the accumulation of different kinds of deposits on the teeth, which promote dental caries.